<div id="panel" class="formio-component formio-component-panel formio-component-panel " ref="component">
  <div class="mb-2 card border">
    <div class="card-header bg-default" ref="header">
      <span class="mb-0 card-title ">
      Panel
    </span>
    </div>
    <div class="card-body" ref="nested-panel">
    </div>
  </div>
  <div ref="messageContainer" class="formio-errors invalid-feedback"></div>
</div>